Legally domain names are allowed to be no longer than 63 characters in length (excluding sub-domains or domain suffixes). While there have been many contenders and claimants for the pole position of longest domain name in the world, I tend to go with the Guinness Book of Records: llanfairpwllgwyngyllgogerychwyrndrobwyll-llantysiliogogogoch.com.The interesting fact relating to this domain name is it is actually a real word, named after a Welsh village! I wonder how many residents have complained to their local postal company regarding lost post?! This website is now under construction, but other candidates could also postulate for that first place, like: iamtheproudownerofthelongestlongestlongestdomainnameinthisworld.com.